CLARK R.R.

CLARK R.R. 13.12. 1886 Pilot Grove IA/USA 01.06. 1977 Lake Oswego OR/USA Roy Ross Clark obtained in 1911 the BSc degree in civil engineering from the Oregon State College, Corvallis OR, and in 1912 made in addition special courses at Cornell University, Ithaca NY. He then was from 1913 to 1917 assistant engineer at Portland OR. After war service in France, he was consultant engineer in Portland OR, dealing with over 200 projects in surveys and designs of irrigation systems. Clark was appointed in 1933 design engineer of the Bonneville Project on the Columbia River, in charge of its spillways. In 1939 he became design engineer of the US Engineers on the Willamette Basin Project in Oregon, for which he designed and constructed two flood control dams. During World War II he was head of the Design Department of air bases, and then returned to the design of flood control and multi-purpose dams, in particular contributing to the McNary Dam on the Columbia River, and four Snake River Dams in Idaho and Oregon States. He also served as a vice-president of the Board of Governors, the Oregon State College. He was a member of the American Society of Civil Engineers ASCE, and the Professional Engineers of Oregon. Clark was mainly a designer and builder of irrigation schemes and dam constructions, so that he has written relatively few papers. Some deal with the optimum constituents of cements for dam design. The 1936 paper is an experimental study on the handling of large lift gates at Bonneville Dam. The Dam was designed for a maximum discharge of 45,000 m3/s passing through 18 bays, each 16 m wide. The discharge is controlled with roller gates, each consisting of two sections raised or lowered by direct lift from a crane. Each gate section weighs 260 t. A hydraulic model at scale 1:10 was prepared to study the discharge characteristics, the pressure distribution, and the correct operation of the entire set-up. Anonymous (1948). Clark, Roy R. Who’s who in engineering 6: 357-358. Lewis: New York. Clark, R.R. (1936). Spillway gate model supplements calculations. Engineering News-Record 116(Mar.05): 343. Clark, R.R. (1937). The value of Portland Puzzolan cement in mass concrete. Oregon State College: Corvallis OR. Clarke, R.R. (1956). Bonneville Dam stilling basin repaired after 17 years. Journal of the American Concrete Institute 27(8): 821-837. https://records.ancestry.com/Ross_Clark_records.ashx?pid=73480770 P

CLAUSER F.H. 25.05. 1913 Kansas MO/USA 03.03. 2013 La Canada CA/USA Francis Hettinger Clauser obtained his BS degree in 1934, and the PhD degree in aeronautics in 1937 from Caltech. He was for the next ten years engineer of aerodynamic design with Douglas Aircraft Corp., from 1946 to 1960 then professor of aeronautics and department chairman at Johns Hopkins University, Baltimore MD, when joining University of California, Santa Cruz CA, as professor of mechanics until 1964, and as professor of engineering and vice-chancellor until 1969. Then Clauser was until his retirement in 1980 professor of aeronautics and Clark B. Millikan engineering professor at Caltech, Pasadena CA. He was recipient of the Alumni Distinguished Scientific Award from Caltech in 1966, and was a Fellow AIAA, the American Physical Society, the American Academy of Arts and Science, and from 1970 Member of the National Academy of Engineering, with the citation ‘For innovations in engineering research and education’. At Johns Hopkins Clauser established the Department of Aeronautics. He published widely in the fields of aerodynamics, of non-linear mechanics, fluid dynamics and on the reduction of combustion engine emissions. His 1937 PhD thesis deals with the curvature effect on the transition from laminar to turbulent boundary layers, a topic in which his tutor Theodor von Karman (1881-1963) was interested since decades. The result was applied to flows over the upper surface of a wing. The discrepancy between the predicted and the actual transition point was due to the effect of streamline curvature, which may become relatively large due to the relatively small wing curvature radius. Anonymous (1949). Francis H. Clauser. Aeronautical Engineering 8(3): 16. P Anonymous (1954). Clauser, Francis H. Who’s who in engineering 7: 441. Lewis: New York. Anonymous (1994). Clauser, Francis H. American men and women in science 2: 325. Clauser, F.H. (1954). Ramjet diffusers at supersonic speeds. Journal American Rocket Society 23(2): 79-84. Clauser, F.H. (1956). The turbulent boundary layer. Advances in applied mechanics: 1-51, H.L. Dryden, T. von Karman, eds. Academic Press: New York. Clauser, F.H. (1957). The structure of turbulent shear flow. Nature 179(4550): 60. Clauser, F.H. (1960). Plasma dynamics. Aeronautics and Astronautics: 305-343, N.J. Hoff, W.G. Vincenti, eds. Pergamon Press: Oxford. P Clauser, M., Clauser, F.H. (1937). The effect of curvature on the transition from laminar to turbulent boundary layer. NACA Technical Note 613. Washington DC.